Case Study: Internet Access

These are the exact programs that I used in class on Thursday 8th April 1999. They compile perfectly on rabbit. For other unix computers you may have to change some of the include directives in includes.h, but everything else should remain the same.

If you download them, you'll have to change their names slightly; I had to make them all end in ".txt" so that web browsers don't try to do stupid things with them.

To compile, you go through the following steps:

CC -c internet.cpp
CC -c internet_client.cpp
CC -c internet_server.cpp
CC -c client.cpp
CC -c server.cpp
CC client.o internet_client.o internet.o -o client
CC server.o internet_server.o internet.o -o server

To run the server in the background, type

server &

and note down the port number it tells you. To run the client, type

client rabbit.eng.miami.edu 1234

Of course, substituting the correct port number for 1234, and the correct computer name if you're not on rabbit.

REMEMBER when you log out to kill the server process. To do this, type

ps

and note down the "process id" numbers of all the processes running your server. Then for each, type

kill -9 3456

substituting the appropriate process number for 3456 of course.

If you want the ugly C version that we looked at first, here are server.c and client.c, and an explanation of how they work.